| 摘要 |
PURPOSE:To prevent mist contained in exhaust gas from sticking on the filter cloth of a bag filter by providing an air pressure feeder wherein dust collected in the bag filter provided to the rear step of an exhaust box is returned to the exhaust box thereby. CONSTITUTION:An exhaust box 2 is provided to the end part of an exhaust side of a dryer drum 1 heating a waste material of asphalt pavement and a bag filter 4 is connected to the exhaust box 2 via a duct 3. A screw conveyor 10 for sending out dust which is trapped by filter cloth 6 and allowed to fall is provided to the lower part of a casing 5 of the bag filter 4, and an air pressure feeder 14 connecting a blower 13 to a pipe 12 is provided between the screw conveyer 10 and the exhaust box 2. Therefore dust trapped on the filter cloth 6 is forcibly jetted to a separator 15 by means of the blower 13 and light dry dust sticks to asphalt mist contained in exhaust gas, and the sticking force of this mist on the filter cloth 6 is reduced.
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